we can earn LBT only if im using your signature ? sound like tricky promotion but goodluck with your business im wrong i think is #airdrop

No you don't need to use forum signatures. Just follow the instructions given in the thread for the airdrop and you will be rolled in. If you want to be part of the signature campaign only then you need to use forum signatures.

Building a Decentralized Anonymous Marketplace (DAM) for the masses. ANN thread

I'm assuming we have to add it to our eth wallet as a custom token to receive the airdrop? What are the symbol, contract address, and decimal values?

Just follow the airdrop instructions at the top of this thread and that is it. You will receive Libre Tokens (LBT) in your ethereum wallet before the pre-ICO along with announcement of contract address. Airdrop transactions will be recorded in ethereum blockchain and whenever you need to move the tokens to transfer or deposit on an exchange then at that time you can add the contract address in your ETH wallet and LBT will appear in your wallets. In the meantime if you'll like to check how many LBT you have received in the Oct 15 airdrop then simply go to the project site https://librebazaar.org and click Libre Tokens Airdrop and then in check status tab enter your airdrop key and ethereum wallet address to check the balance. LBT have 10^8 base units.